Interface fix: allows to remove a tag from the selection into
subtitle bar thanks to a *.

New Feature: authorizes anchors with brackets into descriptions
of bookmark. For example: "[city]Paris[/city]".
This text between anchors will be highlighted when the
corresponding bookmark will be displayed.

You can now create a synonym link between tags.
For example, by linking the tags "monument" and "monuments",
you can find resources tagged with the first one when you navigate
through the second one. More important, this link works with
the inclusion link already implemented.

Users can create commune descriptions for tags and bookmarks.
In a small community, the idea is to bring gradually people to work
together (if they want it). From a research perspective, we explore
the bridge between individual actions (easy to do) and collaborative
ones (more difficult but more powerful).

All the changes:

Interface design: allow to access to users' bookmarks from last
user sidebox. (Currently, we can just access to their profiles).

Interface design: hide multiple URLs repeated into history page

Interface design: hide About link for logged users

New feature: Collaborative spaces (like wiki) for descriptions
of tags and bookmarks